package org.apache.maven.model.building;

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

import java.util.EnumSet;
import java.util.List;
import java.util.Set;

import org.apache.maven.model.Model;
import org.apache.maven.model.io.ModelParseException;

/**
 * Collects problems that are encountered during model building. The primary purpose of this
 * component is to account for the fact that the problem reporter has/should not have information
 * about the calling context and hence cannot provide an expressive source hint for the model
 * problem. Instead, the source hint is configured by the model builder before it delegates to other
 * components that potentially encounter problems. Then, the problem reporter can focus on providing
 * a simple error message, leaving the donkey work of creating a nice model problem to this
 * component.
 * 
 * @author Benjamin Bentmann
 */
class DefaultModelProblemCollector implements ModelProblemCollectorExt {

  private final ModelBuildingResult result;

  private List<ModelProblem> problems;

  private String source;

  private Model sourceModel;

  private Model rootModel;

  private Set<ModelProblem.Severity> severities = EnumSet.noneOf(ModelProblem.Severity.class);

  public DefaultModelProblemCollector(ModelBuildingResult result) {
    this.result = result;
    this.problems = result.getProblems();

    for (ModelProblem problem : this.problems) {
      severities.add(problem.getSeverity());
    }
  }

  public boolean hasFatalErrors() {
    return severities.contains(ModelProblem.Severity.FATAL);
  }

  public boolean hasErrors() {
    return severities.contains(ModelProblem.Severity.ERROR) || severities.contains(ModelProblem.Severity.FATAL);
  }

  public List<ModelProblem> getProblems() {
    return problems;
  }

  public void setSource(String source) {
    this.source = source;
    this.sourceModel = null;
  }

  public void setSource(Model source) {
    this.sourceModel = source;
    this.source = null;

    if (rootModel == null) {
      rootModel = source;
    }
  }

  private String getSource() {
    if (source == null && sourceModel != null) {
      source = ModelProblemUtils.toPath(sourceModel);
    }
    return source;
  }

  private String getModelId() {
    return ModelProblemUtils.toId(sourceModel);
  }

  public void setRootModel(Model rootModel) {
    this.rootModel = rootModel;
  }

  public Model getRootModel() {
    return rootModel;
  }

  public String getRootModelId() {
    return ModelProblemUtils.toId(rootModel);
  }

  public void add(ModelProblem problem) {
    problems.add(problem);

    severities.add(problem.getSeverity());
  }

  public void addAll(List<ModelProblem> problems) {
    this.problems.addAll(problems);

    for (ModelProblem problem : problems) {
      severities.add(problem.getSeverity());
    }
  }

  public void add(ModelProblemCollectorRequest req) {
    int line = -1;
    int column = -1;
    String source = null;
    String modelId = null;

    if (req.getLocation() != null) {
      line = req.getLocation().getLineNumber();
      column = req.getLocation().getColumnNumber();
      if (req.getLocation().getSource() != null) {
        modelId = req.getLocation().getSource().getModelId();
        source = req.getLocation().getSource().getLocation();
      }
    }

    if (modelId == null) {
      modelId = getModelId();
      source = getSource();
    }

    if (line <= 0 && column <= 0 && req.getException() instanceof ModelParseException) {
      ModelParseException e = (ModelParseException) req.getException();
      line = e.getLineNumber();
      column = e.getColumnNumber();
    }

    ModelProblem problem = new DefaultModelProblem(req.getMessage(), req.getSeverity(), req.getVersion(), source, line,
        column, modelId, req.getException());

    add(problem);
  }

  public ModelBuildingException newModelBuildingException() {
    ModelBuildingResult result = this.result;
    if (result.getModelIds().isEmpty()) {
      DefaultModelBuildingResult tmp = new DefaultModelBuildingResult();
      tmp.setEffectiveModel(result.getEffectiveModel());
      tmp.setProblems(getProblems());
      tmp.setActiveExternalProfiles(result.getActiveExternalProfiles());
      String id = getRootModelId();
      tmp.addModelId(id);
      tmp.setRawModel(id, getRootModel());
      result = tmp;
    }
    return new ModelBuildingException(result);
  }

}
